JPH01277942A - Source row display system for execution abnormal instruction - Google Patents

Abstract

PURPOSE:To simplify a program and to reduce the number of dynamic steps by setting a source row number to a NOP instruction effective address part given from hardware at the time of issue of an instruction where there is a probability of abnormality due to wrong data during execution of an object program. CONSTITUTION:A source program is inputted to a main program storage means 3 through a source program storage means 5, and the end of input is discriminated in the means 3, and the processing is continued when the end is not discriminated, and the end is discriminated otherwise. An object program is generated for the program stored in the means 3 and is outputted to an object program storage means 4, and it is checked whether a NOP instruction should be generated or not. Thereafter, the source row number for the object program which is discriminated by the processing which discriminates an instruction where abnormality may occur is inputted to the means 3 from a source row number storage means 6, and the obtained source row number is set to the effective address part of the NOP instruction, and the object program including the NOP instruction is outputted to the means 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a source line display method for an execution abnormal instruction, and particularly to a north line displayed in post-processing of an abnormal termination that occurs during execution of a target program.

(Prior Art) Conventionally, in the source line display method for this heel execution abnormal instruction, it goes without saying that an abnormality may occur due to invalid data during execution of the target program. Before outputting , the program outputs an instruction to fetch the constant image of the source line number into a register, and an instruction to set the contents of that register in a fixed table. If an abnormality occurs due to invalid data during execution of a target program, a method is known in which the source line number is retrieved from a fixed table in post-processing after the abnormal termination, and the north line number of the source program is displayed by a message.

(Problem to be Solved by the Invention) In the conventional source line display method for execution abnormal instructions described above, when the target program is executed, the source line is displayed before outputting an instruction that may cause an abnormality due to invalid data. Because it outputs an instruction to fetch a constant image of a number into a register and an instruction to set the contents of that register in a fixed table, the target program becomes large, the number of dynamic steps increases, and a fixed table is required. There is a drawback.

It is an object of the present invention to solve the above-mentioned problems by incorporating a source line number into the execution address part of a NOP instruction given by hardware to the output hole diameter of an instruction that may cause an abnormality due to invalid data when executing a target program. An object of the present invention is to provide a source line display method for an execution abnormal instruction, which is configured to simplify a program.

(Means for solving the problem) The source line display method for an execution abnormal instruction according to the present invention is configured to include a NOP instruction output means and a program failure post-processing means.

The NOP instruction output means inserts a NOP instruction given by hardware between a hardware instruction that may cause an abnormality due to invalid data during execution of the target program and the next hardware instruction, This is for setting the source line number in the effective address field of the NOP instruction.

When an error occurs due to invalid data during execution of the target program, the program error post-processing means transfers control from the operating system, obtains the address of the instruction where the error occurred, detects the immediately following NOP instruction, and This is for the purpose of extracting the source line number from the effective address field and displaying the line number of the source program corresponding to the instruction in which the error occurred by means of a message.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a source line display method for an abnormally executed instruction according to the present invention.

In FIG. 1, 1 is a NOP command output means, 2 is a program failure post-processing means, 3 is a main program storage means, 4 is a target program storage means, 5 is a source program storage means, 6 is a first line number storage means, and 7 is a printing device.

In the north line display method for execution abnormal instructions, when a source program is input from the source program storage means 5 to the main program storage means 3 of the compiler, the target program is output to the target program storage means 4. After that, when debugging is specified for the main program, it is assumed that the target program is executed.

At this time, if the instruction has a possibility of causing an abnormality due to invalid data, the second line number storage means 6
The north row number is retrieved from.

Therefore, before the next instruction is output, the NOP instruction output means 1 is used to set the NOP number to the effective address field of the NOP instruction given by the hardware.

Here, the NOP instruction output means 1 is for outputting the NOP instruction to the target program storage means 4.

On the other hand, if no abnormality occurs due to invalid data during execution of the target program, control is transferred from the operating system to the program failure post-processing means 2. The program failure post-processing means 2 obtains the address of the instruction in which the abnormality has occurred, searches for the NOP instruction immediately after it, and detects the NOP instruction. Therefore, the printing device 7 extracts the north line number from the effective address field of the NOP instruction and displays the line number of the source program corresponding to the abnormal instruction in the form of a message.

FIG. 2 is a flowchart showing the processing of the main program.

In FIG. 7A2, after inputting the source program from the source program storage means S to the main program storage means 3, it is determined whether the input of the source program is complete. If the process has not ended, it is determined to continue the process, and if it has ended, it is determined that the process has ended.

Next, a target program is generated for the source program obtained by inputting it from the source program storage unit S to the main program storage unit 3, and the generated target program is output to the target program storage unit 4. Therefore, N
Check whether to generate an OP instruction.

FIG. 3 is a flowchart showing the output processing of the target program.

FIG. 4 is a flowchart showing the output calling process of the target program.

In FIG. 4, first, if a debug option is specified for the main program, it is determined that it is present, and if it is not specified, it is determined that it is not present. When executing the target program output by the output process of the target program shown in Figure 8, if the instruction has the possibility of causing an abnormality due to invalid data, select "Acceptable"; if the instruction has no possibility, select "Not possible". It is determined that

Next, the source line number for the target program determined by the abnormality occurrence instruction determination processing is input from the source line number storage means 8 to the main program storage means 3. Therefore,
The obtained nine source line numbers are set in the effective address field of the NOP instruction to generate the NOP instruction. Next, the target program including the NOP instruction is output to the target program storage means 4.

FIG. 5 is a flowchart showing the process of outputting the target program.

In Figure 5, if an error occurs due to invalid data during execution of the target program, the address of the instruction where the error occurred is obtained from the operating system, the NOP instruction immediately after it is detected, and the effective address part of the NOP instruction is detected. Get the north row number. The line numbers obtained through the above processing are output to the printing device 7 in order to be displayed as a message.

(Effects of the Invention) As explained above, the present invention provides a source program for the effective address section of the NOP instruction given by hardware after the instruction that may cause an error due to invalid data is output when the target program is executed. Incorporating line numbers has the following disadvantages: the scale of the target program becomes larger and the number of dynamic steps increases.

Nineteen, it has the disadvantage of requiring a fixed table.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a source line display method for an abnormally executed instruction according to the present invention. 2 to 5 are flowcharts showing the flow of processing executed by the blocks shown in FIG. 1, respectively. 1...NOP command output means 2...Program failure post-processing means 3...Main program storage means 4...Object program storage means 5-...Source program storage means 6...Source line number storage means 7...Printing device

Claims (1)

[Claims] A NOP instruction given by hardware is inserted between a hardware instruction that may cause an abnormality due to invalid data when executing the target program and the next hardware instruction, and the effective address part of the NOP instruction is NOP command output means for setting a source line number; and when an error occurs due to the invalid data during execution of the target program, control is transferred from the operating system and immediately after obtaining the address of the instruction where the error occurred; NO
and a program failure post-processing means for detecting a P instruction, extracting a source line number from an effective address part of the NOP instruction, and displaying a message indicating the line number of the source program corresponding to the instruction in which the abnormality has occurred. A source line display method for an execution abnormal instruction, characterized in that the source line display method is configured as follows.